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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH RFC V2 25/45] xen/sched: use sched_resource cpu instead smp_processor_id in schedulers
Especially in the do_schedule() functions of the different schedulers
using smp_processor_id() for the local cpu number is correct only if
the sched_item is a single vcpu. As soon as larger sched_items are
used most uses should be replaced by the cpu number of the local
sched_resource instead.
Add a helper to get that sched_resource cpu and modify the schedulers
to use it in a correct way.
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
xen/common/sched_arinc653.c | 2 +-
xen/common/sched_credit.c | 19 ++++++++--------
xen/common/sched_credit2.c | 53 +++++++++++++++++++++++----------------------
xen/common/sched_null.c | 17 ++++++++-------
xen/common/sched_rt.c | 17 ++++++++-------
xen/include/xen/sched-if.h | 5 +++++
6 files changed, 61 insertions(+), 52 deletions(-)
diff --git a/xen/common/sched_arinc653.c b/xen/common/sched_arinc653.c
index 61f9ea6824..3919c0a3e9 100644
--- a/xen/common/sched_arinc653.c
+++ b/xen/common/sched_arinc653.c
@@ -513,7 +513,7 @@ a653sched_do_schedule(
static unsigned int sched_index = 0;
static s_time_t next_switch_time;
a653sched_priv_t *sched_priv = SCHED_PRIV(ops);
- const unsigned int cpu = smp_processor_id();
+ const unsigned int cpu = sched_get_resource_cpu(smp_processor_id());
unsigned long flags;
spin_lock_irqsave(&sched_priv->lock, flags);
diff --git a/xen/common/sched_credit.c b/xen/common/sched_credit.c
index 9db5c3fc71..4734f52fc7 100644
--- a/xen/common/sched_credit.c
+++ b/xen/common/sched_credit.c
@@ -1839,8 +1839,9 @@ static struct task_slice
csched_schedule(
const struct scheduler *ops, s_time_t now, bool_t tasklet_work_scheduled)
{
- const int cpu = smp_processor_id();
- struct list_head * const runq = RUNQ(cpu);
+ const unsigned int cpu = smp_processor_id();
+ const unsigned int sched_cpu = sched_get_resource_cpu(cpu);
+ struct list_head * const runq = RUNQ(sched_cpu);
struct sched_item *item = current->sched_item;
struct csched_item * const scurr = CSCHED_ITEM(item);
struct csched_private *prv = CSCHED_PRIV(ops);
@@ -1950,7 +1951,7 @@ csched_schedule(
{
BUG_ON( is_idle_item(item) || list_empty(runq) );
/* Current has blocked. Update the runnable counter for this cpu. */
- dec_nr_runnable(cpu);
+ dec_nr_runnable(sched_cpu);
}
snext = __runq_elem(runq->next);
@@ -1960,7 +1961,7 @@ csched_schedule(
if ( tasklet_work_scheduled )
{
TRACE_0D(TRC_CSCHED_SCHED_TASKLET);
- snext = CSCHED_ITEM(sched_idle_item(cpu));
+ snext = CSCHED_ITEM(sched_idle_item(sched_cpu));
snext->pri = CSCHED_PRI_TS_BOOST;
}
@@ -1980,7 +1981,7 @@ csched_schedule(
if ( snext->pri > CSCHED_PRI_TS_OVER )
__runq_remove(snext);
else
- snext = csched_load_balance(prv, cpu, snext, &ret.migrated);
+ snext = csched_load_balance(prv, sched_cpu, snext, &ret.migrated);
/*
* Update idlers mask if necessary. When we're idling, other CPUs
@@ -1988,12 +1989,12 @@ csched_schedule(
*/
if ( !tasklet_work_scheduled && snext->pri == CSCHED_PRI_IDLE )
{
- if ( !cpumask_test_cpu(cpu, prv->idlers) )
- cpumask_set_cpu(cpu, prv->idlers);
+ if ( !cpumask_test_cpu(sched_cpu, prv->idlers) )
+ cpumask_set_cpu(sched_cpu, prv->idlers);
}
- else if ( cpumask_test_cpu(cpu, prv->idlers) )
+ else if ( cpumask_test_cpu(sched_cpu, prv->idlers) )
{
- cpumask_clear_cpu(cpu, prv->idlers);
+ cpumask_clear_cpu(sched_cpu, prv->idlers);
}
if ( !is_idle_item(snext->item) )
diff --git a/xen/common/sched_credit2.c b/xen/common/sched_credit2.c
index 7918d46a23..d5cb8c0200 100644
--- a/xen/common/sched_credit2.c
+++ b/xen/common/sched_credit2.c
@@ -3447,7 +3447,8 @@ static struct task_slice
csched2_schedule(
const struct scheduler *ops, s_time_t now, bool tasklet_work_scheduled)
{
- const int cpu = smp_processor_id();
+ const unsigned int cpu = smp_processor_id();
+ const unsigned int sched_cpu = sched_get_resource_cpu(cpu);
struct csched2_runqueue_data *rqd;
struct sched_item *curritem = current->sched_item;
struct csched2_item * const scurr = csched2_item(curritem);
@@ -3459,22 +3460,22 @@ csched2_schedule(
SCHED_STAT_CRANK(schedule);
CSCHED2_ITEM_CHECK(curritem);
- BUG_ON(!cpumask_test_cpu(cpu, &csched2_priv(ops)->initialized));
+ BUG_ON(!cpumask_test_cpu(sched_cpu, &csched2_priv(ops)->initialized));
- rqd = c2rqd(ops, cpu);
- BUG_ON(!cpumask_test_cpu(cpu, &rqd->active));
+ rqd = c2rqd(ops, sched_cpu);
+ BUG_ON(!cpumask_test_cpu(sched_cpu, &rqd->active));
- ASSERT(spin_is_locked(per_cpu(sched_res, cpu)->schedule_lock));
+ ASSERT(spin_is_locked(per_cpu(sched_res, sched_cpu)->schedule_lock));
BUG_ON(!is_idle_item(curritem) && scurr->rqd != rqd);
/* Clear "tickled" bit now that we've been scheduled */
- tickled = cpumask_test_cpu(cpu, &rqd->tickled);
+ tickled = cpumask_test_cpu(sched_cpu, &rqd->tickled);
if ( tickled )
{
- __cpumask_clear_cpu(cpu, &rqd->tickled);
+ __cpumask_clear_cpu(sched_cpu, &rqd->tickled);
cpumask_andnot(cpumask_scratch, &rqd->idle, &rqd->tickled);
- smt_idle_mask_set(cpu, cpumask_scratch, &rqd->smt_idle);
+ smt_idle_mask_set(sched_cpu, cpumask_scratch, &rqd->smt_idle);
}
if ( unlikely(tb_init_done) )
@@ -3484,10 +3485,10 @@ csched2_schedule(
unsigned tasklet:8, idle:8, smt_idle:8, tickled:8;
} d;
d.cpu = cpu;
- d.rq_id = c2r(cpu);
+ d.rq_id = c2r(sched_cpu);
d.tasklet = tasklet_work_scheduled;
d.idle = is_idle_item(curritem);
- d.smt_idle = cpumask_test_cpu(cpu, &rqd->smt_idle);
+ d.smt_idle = cpumask_test_cpu(sched_cpu, &rqd->smt_idle);
d.tickled = tickled;
__trace_var(TRC_CSCHED2_SCHEDULE, 1,
sizeof(d),
@@ -3527,10 +3528,10 @@ csched2_schedule(
{
__clear_bit(__CSFLAG_item_yield, &scurr->flags);
trace_var(TRC_CSCHED2_SCHED_TASKLET, 1, 0, NULL);
- snext = csched2_item(sched_idle_item(cpu));
+ snext = csched2_item(sched_idle_item(sched_cpu));
}
else
- snext = runq_candidate(rqd, scurr, cpu, now, &skipped_items);
+ snext = runq_candidate(rqd, scurr, sched_cpu, now, &skipped_items);
/* If switching from a non-idle runnable item, put it
* back on the runqueue. */
@@ -3555,10 +3556,10 @@ csched2_schedule(
}
/* Clear the idle mask if necessary */
- if ( cpumask_test_cpu(cpu, &rqd->idle) )
+ if ( cpumask_test_cpu(sched_cpu, &rqd->idle) )
{
- __cpumask_clear_cpu(cpu, &rqd->idle);
- smt_idle_mask_clear(cpu, &rqd->smt_idle);
+ __cpumask_clear_cpu(sched_cpu, &rqd->idle);
+ smt_idle_mask_clear(sched_cpu, &rqd->smt_idle);
}
/*
@@ -3577,18 +3578,18 @@ csched2_schedule(
*/
if ( skipped_items == 0 && snext->credit <= CSCHED2_CREDIT_RESET )
{
- reset_credit(ops, cpu, now, snext);
- balance_load(ops, cpu, now);
+ reset_credit(ops, sched_cpu, now, snext);
+ balance_load(ops, sched_cpu, now);
}
snext->start_time = now;
snext->tickled_cpu = -1;
/* Safe because lock for old processor is held */
- if ( sched_item_cpu(snext->item) != cpu )
+ if ( sched_item_cpu(snext->item) != sched_cpu )
{
snext->credit += CSCHED2_MIGRATE_COMPENSATION;
- sched_set_res(snext->item, per_cpu(sched_res, cpu));
+ sched_set_res(snext->item, per_cpu(sched_res, sched_cpu));
SCHED_STAT_CRANK(migrated);
ret.migrated = 1;
}
@@ -3601,17 +3602,17 @@ csched2_schedule(
*/
if ( tasklet_work_scheduled )
{
- if ( cpumask_test_cpu(cpu, &rqd->idle) )
+ if ( cpumask_test_cpu(sched_cpu, &rqd->idle) )
{
- __cpumask_clear_cpu(cpu, &rqd->idle);
- smt_idle_mask_clear(cpu, &rqd->smt_idle);
+ __cpumask_clear_cpu(sched_cpu, &rqd->idle);
+ smt_idle_mask_clear(sched_cpu, &rqd->smt_idle);
}
}
- else if ( !cpumask_test_cpu(cpu, &rqd->idle) )
+ else if ( !cpumask_test_cpu(sched_cpu, &rqd->idle) )
{
- __cpumask_set_cpu(cpu, &rqd->idle);
+ __cpumask_set_cpu(sched_cpu, &rqd->idle);
cpumask_andnot(cpumask_scratch, &rqd->idle, &rqd->tickled);
- smt_idle_mask_set(cpu, cpumask_scratch, &rqd->smt_idle);
+ smt_idle_mask_set(sched_cpu, cpumask_scratch, &rqd->smt_idle);
}
/* Make sure avgload gets updated periodically even
* if there's no activity */
@@ -3621,7 +3622,7 @@ csched2_schedule(
/*
* Return task to run next...
*/
- ret.time = csched2_runtime(ops, cpu, snext, now);
+ ret.time = csched2_runtime(ops, sched_cpu, snext, now);
ret.task = snext->item;
CSCHED2_ITEM_CHECK(ret.task);
diff --git a/xen/common/sched_null.c b/xen/common/sched_null.c
index ceb026c8af..34ce7a05d3 100644
--- a/xen/common/sched_null.c
+++ b/xen/common/sched_null.c
@@ -709,6 +709,7 @@ static struct task_slice null_schedule(const struct
scheduler *ops,
{
unsigned int bs;
const unsigned int cpu = smp_processor_id();
+ const unsigned int sched_cpu = sched_get_resource_cpu(cpu);
struct null_private *prv = null_priv(ops);
struct null_item *wvc;
struct task_slice ret;
@@ -724,14 +725,14 @@ static struct task_slice null_schedule(const struct
scheduler *ops,
} d;
d.cpu = cpu;
d.tasklet = tasklet_work_scheduled;
- if ( per_cpu(npc, cpu).item == NULL )
+ if ( per_cpu(npc, sched_cpu).item == NULL )
{
d.item = d.dom = -1;
}
else
{
- d.item = per_cpu(npc, cpu).item->item_id;
- d.dom = per_cpu(npc, cpu).item->domain->domain_id;
+ d.item = per_cpu(npc, sched_cpu).item->item_id;
+ d.dom = per_cpu(npc, sched_cpu).item->domain->domain_id;
}
__trace_var(TRC_SNULL_SCHEDULE, 1, sizeof(d), &d);
}
@@ -739,10 +740,10 @@ static struct task_slice null_schedule(const struct
scheduler *ops,
if ( tasklet_work_scheduled )
{
trace_var(TRC_SNULL_TASKLET, 1, 0, NULL);
- ret.task = sched_idle_item(cpu);
+ ret.task = sched_idle_item(sched_cpu);
}
else
- ret.task = per_cpu(npc, cpu).item;
+ ret.task = per_cpu(npc, sched_cpu).item;
ret.migrated = 0;
ret.time = -1;
@@ -773,9 +774,9 @@ static struct task_slice null_schedule(const struct
scheduler *ops,
!has_soft_affinity(wvc->item) )
continue;
- if ( item_check_affinity(wvc->item, cpu, bs) )
+ if ( item_check_affinity(wvc->item, sched_cpu, bs) )
{
- item_assign(prv, wvc->item, cpu);
+ item_assign(prv, wvc->item, sched_cpu);
list_del_init(&wvc->waitq_elem);
ret.task = wvc->item;
goto unlock;
@@ -787,7 +788,7 @@ static struct task_slice null_schedule(const struct
scheduler *ops,
}
if ( unlikely(ret.task == NULL || !item_runnable(ret.task)) )
- ret.task = sched_idle_item(cpu);
+ ret.task = sched_idle_item(sched_cpu);
NULL_ITEM_CHECK(ret.task);
return ret;
diff --git a/xen/common/sched_rt.c b/xen/common/sched_rt.c
index 730aa292d4..2366e33beb 100644
--- a/xen/common/sched_rt.c
+++ b/xen/common/sched_rt.c
@@ -1065,7 +1065,8 @@ runq_pick(const struct scheduler *ops, const cpumask_t
*mask)
static struct task_slice
rt_schedule(const struct scheduler *ops, s_time_t now, bool_t
tasklet_work_scheduled)
{
- const int cpu = smp_processor_id();
+ const unsigned int cpu = smp_processor_id();
+ const unsigned int sched_cpu = sched_get_resource_cpu(cpu);
struct rt_private *prv = rt_priv(ops);
struct rt_item *const scurr = rt_item(current->sched_item);
struct rt_item *snext = NULL;
@@ -1079,7 +1080,7 @@ rt_schedule(const struct scheduler *ops, s_time_t now,
bool_t tasklet_work_sched
} d;
d.cpu = cpu;
d.tasklet = tasklet_work_scheduled;
- d.tickled = cpumask_test_cpu(cpu, &prv->tickled);
+ d.tickled = cpumask_test_cpu(sched_cpu, &prv->tickled);
d.idle = is_idle_item(curritem);
trace_var(TRC_RTDS_SCHEDULE, 1,
sizeof(d),
@@ -1087,7 +1088,7 @@ rt_schedule(const struct scheduler *ops, s_time_t now,
bool_t tasklet_work_sched
}
/* clear ticked bit now that we've been scheduled */
- cpumask_clear_cpu(cpu, &prv->tickled);
+ cpumask_clear_cpu(sched_cpu, &prv->tickled);
/* burn_budget would return for IDLE ITEM */
burn_budget(ops, scurr, now);
@@ -1095,13 +1096,13 @@ rt_schedule(const struct scheduler *ops, s_time_t now,
bool_t tasklet_work_sched
if ( tasklet_work_scheduled )
{
trace_var(TRC_RTDS_SCHED_TASKLET, 1, 0, NULL);
- snext = rt_item(sched_idle_item(cpu));
+ snext = rt_item(sched_idle_item(sched_cpu));
}
else
{
- snext = runq_pick(ops, cpumask_of(cpu));
+ snext = runq_pick(ops, cpumask_of(sched_cpu));
if ( snext == NULL )
- snext = rt_item(sched_idle_item(cpu));
+ snext = rt_item(sched_idle_item(sched_cpu));
/* if scurr has higher priority and budget, still pick scurr */
if ( !is_idle_item(curritem) &&
@@ -1126,9 +1127,9 @@ rt_schedule(const struct scheduler *ops, s_time_t now,
bool_t tasklet_work_sched
q_remove(snext);
__set_bit(__RTDS_scheduled, &snext->flags);
}
- if ( sched_item_cpu(snext->item) != cpu )
+ if ( sched_item_cpu(snext->item) != sched_cpu )
{
- sched_set_res(snext->item, per_cpu(sched_res, cpu));
+ sched_set_res(snext->item, per_cpu(sched_res, sched_cpu));
ret.migrated = 1;
}
ret.time = snext->cur_budget; /* invoke the scheduler next time */
diff --git a/xen/include/xen/sched-if.h b/xen/include/xen/sched-if.h
index 65e2c3bba8..2506538649 100644
--- a/xen/include/xen/sched-if.h
+++ b/xen/include/xen/sched-if.h
@@ -100,6 +100,11 @@ static inline struct sched_item *sched_idle_item(unsigned
int cpu)
return idle_vcpu[cpu]->sched_item;
}
+static inline unsigned int sched_get_resource_cpu(unsigned int cpu)
+{
+ return per_cpu(sched_res, cpu)->processor;
+}
+
/*
* Scratch space, for avoiding having too many cpumask_t on the stack.
* Within each scheduler, when using the scratch mask of one pCPU:
--
2.16.4
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